Learning objectives
basical knowledge of the formation and of the reactivity of crystalline solids, of their periodic stucture and of the originated diffraction process at the basis of their caracterization
Prerequisites
- - -
Course unit content
The crystal state. Origin of 3D-periodicity. Crystallization. Nucleation and growth. Amorphous materials and glasses.
Bravais lattice and crystal lattice. Symmetry classification. Point symmetry. Point groups of Bravais lattices: the 7 crystallographic systems. Point group of crystal lattices: the 32 crystallographic classes. Symmetry operation involving translation. Space groups of crystal lattices.
X-rays. Scattering process: Thompson and Compton. Atomic scattering factor. Scattering from ordered systems: the diffraction process. Bragg's law and Laue's equations. Reciprocal lattice. Ewald sphere. Structure factor and equation of the electron density. Reletionships between diffraction and lattice simmetry. The phase problem in crystallography and its possible solution.
Practical aspects of X-ray diffraction. Single crystal and powder diffraction. Crystallographic data bases.
Classification of crystal structures. Close packing and eutactic models. Principal types of binary and ternary structures.
Polymorphysmus and phase transitions. Kinetic and thermodynamic classifications. Continuos phase transitions. Crystallographic trends in phase transitions.
Solid solutions: interstitial and substitutional. Heterovalent substitutions and charge compensation mechanisms.
Reactivity of solid. Solid state reactions. Principles and mechanisms.Experimental aspects. Sintering and ceramic materials.
Full programme
- - -
Bibliography
A.R.West
Solid state chemistry and its applications
John Wiley & Sons Ltd., Chichester
lecture notes
Teaching methods
lectures and exercitations
Assessment methods and criteria
oral examination
Other information
- - -